[Yoda]

it also make it much easier to feel the 'cup' of the right hand supporting the left thumb, and has the added benefit of really solidifying the wedges.

Thanks Homer

In your progress toward Golfing Perfection, these are two of the most important Feels you can cultivate:

1. The Left Thumb directly behind and supporting the Shaft; and

2. The Right Hand Cup covering the Thumb and thereby buttressing this critical Alignment while also adding its own.

Monitor these Feels at first individually and then in their unity. Be aware of the in-line 'Cup-Thumb-Shaft' Pressure (1) at Fix and Adjusted Address; (2) at the Top; (3) through Impact to Both Arms Straight; and (4) at the Finish.

As EdZ has stated, this dual, On Plane, Behind-the-Shaft support solidifies the Flying Wedges and in so doing, gives the player an incredible sense of Clubhead Control. If you ever get a chance to watch Trevino, either on tape or in person, check out his glove: You'll find it always taped at the first joint of the Thumb.

Its not called the #1 Pressure Point for nothing!